This one is kind of gamebreaking, I wanted to test it because the concept happened in my head and I tried a little mythbusting, after picking up the Gjallarhorn from the quest mission in "Beauty in Delivery" after you fend off the Fallen, you acquire the Ghorn in your inventory, if you leave the mission and come back you can redo the whole process and continue getting duplicates of the Gjallarhorn giving you more and more shards and 350 Heavy weapons if your light level isn't relevant enough to pass that yet. It's kind of a tedious process because you have to redo guarding Ghost repairing the last component and he takes forever (sorry guy). I've only done this once and I just wanted to point it out to see if something could be done about it